scholarly journals Pressure-induced spin-Peierls to incommensurate charge-density-wave transition in the ground state of TiOCl

2010 ◽  
Vol 81 (20) ◽  
Author(s):  
A. Prodi ◽  
J. S. Helton ◽  
Yejun Feng ◽  
Y. S. Lee
Keyword(s):  
Charge Density ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave

CHARGE DENSITY WAVE TRANSITIONS IN TWO-DIMENSIONAL TRANSITION METAL BRONZES AND OXIDES

1993 ◽  
Vol 07 (23n24) ◽  
pp. 3973-4003 ◽  
Author(s):  
P. FOURY ◽  
J.P. POUGET
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave ◽  
Electron Localization ◽  
Two Dimensional ◽  
Fermi Surfaces ◽  
A Charge ◽  
Structural Instabilities

The structural instabilities towards the formation of a charge density wave (CDW) ground state exhibited by several layered Mo and W bronzes and oxides are reviewed. It is shown that in these two-dimensional (2D) metals, including the purple bronzes A x Mo 6 O 17 (A=K, Na, Tl; x≈1), the γ and η phases of MO 4 O 11 and the monophosphate tungsten bronzes with pentagonal tunnels ( PO 2)4 ( WO 3)2m(m=4, 6, 7), the CDW instability can be associated with particular chains of MoO 6 or WO 6 octahedra of the ReO 3 type slabs along which there is a strong overlap of the t 2g orbitals. The CDW critical wave vectors of the purple bronzes, Mo 4 O 11 and the tungsten bronzes with m=4 and 6 lead to a common nesting between differently oriented 1D Fermi surfaces. It is suggested that the anharmonic CDW modulation, which occurs in the tungsten bronzes with m≥7, could be the structural fingerprint of electron localization effects.

scholarly journals Suppression of a charge-density-wave ground state in high magnetic fields: Spin and orbital mechanisms

2004 ◽  
Vol 69 (12) ◽  
Author(s):  
D. Graf ◽  
J. S. Brooks ◽  
E. S. Choi ◽  
S. Uji ◽  
J. C. Dias ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Charge Density ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave ◽  
High Magnetic Fields ◽  
A Charge

scholarly journals Ideal charge-density-wave order in the high-field state of superconducting YBCO

2016 ◽  
Vol 113 (51) ◽  
pp. 14645-14650 ◽  
Author(s):  
H. Jang ◽  
W.-S. Lee ◽  
H. Nojiri ◽  
S. Matsuzawa ◽  
H. Yasumura ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Field ◽  
Ground State ◽  
Charge Density Wave ◽  
High Field ◽  
Cuprate Superconductors ◽  
Density Wave ◽  
Quantum Oscillation ◽  
Zero Field ◽  
Correlation Volume

The existence of charge-density-wave (CDW) correlations in cuprate superconductors has now been established. However, the nature of the CDW ground state has remained uncertain because disorder and the presence of superconductivity typically limit the CDW correlation lengths to only a dozen unit cells or less. Here we explore the field-induced 3D CDW correlations in extremely pure detwinned crystals of YBa2Cu3O2(YBCO) ortho-II and ortho-VIII at magnetic fields in excess of the resistive upper critical field (Hc2) where superconductivity is heavily suppressed. We observe that the 3D CDW is unidirectional and possesses a long in-plane correlation length as well as significant correlations between neighboring CuO2planes. It is significant that we observe only a single sharply defined transition at a critical field proportional toHc2, given that the field range used in this investigation overlaps with other high-field experiments including quantum oscillation measurements. The correlation volume is at least two to three orders of magnitude larger than that of the zero-field CDW. This is by far the largest CDW correlation volume observed in any cuprate crystal and so is presumably representative of the high-field ground state of an “ideal” disorder-free cuprate.

scholarly journals Interpretations of ground-state symmetry breaking and strong correlation in wavefunction and density functional theories

2021 ◽  
Vol 118 (4) ◽  
pp. e2017850118 ◽  
Author(s):  
John P. Perdew ◽  
Adrienn Ruzsinszky ◽  
Jianwei Sun ◽  
Niraj K. Nepal ◽  
Aaron D. Kaplan
Keyword(s):  
Density Functional Theory ◽  
Charge Density ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Functional ◽  
Density Wave ◽  
Static Charge ◽  
Functional Theory ◽  
Correlation Kernel ◽  
Frequency Moments

Strong correlations within a symmetry-unbroken ground-state wavefunction can show up in approximate density functional theory as symmetry-broken spin densities or total densities, which are sometimes observable. They can arise from soft modes of fluctuations (sometimes collective excitations) such as spin-density or charge-density waves at nonzero wavevector. In this sense, an approximate density functional for exchange and correlation that breaks symmetry can be more revealing (albeit less accurate) than an exact functional that does not. The examples discussed here include the stretched H2 molecule, antiferromagnetic solids, and the static charge-density wave/Wigner crystal phase of a low-density jellium. Time-dependent density functional theory is used to show quantitatively that the static charge-density wave is a soft plasmon. More precisely, the frequency of a related density fluctuation drops to zero, as found from the frequency moments of the spectral function, calculated from a recent constraint-based wavevector- and frequency-dependent jellium exchange-correlation kernel.

Probing the superconducting ground state near the charge density wave phase transition inCu0.06TiSe2

2010 ◽  
Vol 81 (9) ◽  
Author(s):  
A. D. Hillier ◽  
P. Manuel ◽  
D. T. Adroja ◽  
J. W. Taylor ◽  
A. K. Azad ◽  
...  
Keyword(s):  
Phase Transition ◽  
Charge Density ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Phase ◽  
Charge Density Wave Phase

Effect of the cooling rate on the transverse magnetoresistance of (TSeT)2Cl in its charge-density wave ground state

1995 ◽  
Vol 211 (1-4) ◽  
pp. 286-289 ◽  
Author(s):  
F. Goze ◽  
A. Audouard ◽  
L. Brossard ◽  
V.N. Laukhin ◽  
J.P. Ulmet ◽  
...  
Keyword(s):  
Charge Density ◽  
Cooling Rate ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transverse Magnetoresistance

scholarly journals Detection of charge density wave ground state in granular thin films of blue bronze K0.3MoO3by femtosecond spectroscopy

2011 ◽  
Vol 110 (1) ◽  
pp. 014907 ◽  
Author(s):  
D. Dominko ◽  
D. Starešinić ◽  
K. Salamon ◽  
K. Biljaković ◽  
A. Tomeljak ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Density ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave ◽  
Femtosecond Spectroscopy ◽  
Blue Bronze
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